Hydrostatic axial piston machine

A hydrostatic axial piston machine of swashplate type of construction, comprising:

• a drive shaft configured to rotate about an axis of rotation;
• a rotatable cylinder drum forming a multiplicity of cylinder bores;
• and
• a piston inserted into each cylinder bore at one side,
• wherein each cylinder bore is connected at the other side via a respective passage opening to a face surface of the cylinder drum, each passage opening oriented obliquely with respect to its respective cylinder bore,
• wherein each piston is configured to reciprocate along an axis that is not parallel to the axis of rotation of the drive shaft,
• wherein a respective mouth of each passage opening is arranged in the face surface and has a cross section that has two or four cross-sectional widenings with rounded corners,
• wherein the cross section has an outer curvature and an inner curvature
• wherein the outer curvature is arranged radially further toward the outside than a circular arc-shaped elongation of the inner curvature,
• wherein the outer curvature and the circular arc-shaped elongation have a distance therebetween, and
• wherein a kidney-shaped suction port of a distributor disk that bears against the face surface is broadened radially by the distance in relation to a kidney-shaped pressure port.